What did the groom's family pay for? FH is upset with his parents...

My FH has two older sisters. His parents gave each of them $8000 for their wedding and told them to do what they wanted with it. They could go to Vegas, have a big traditional wedding, or even pocket it for their personal use and get married at the courthouse. Both daughters chose to have traditional weddings and pay off credit card debt with the leftover money. So far his parents have said they want to help with the wedding but haven't told my FH what they want to help with exactly. I think he is a little upset that they are not offering us the $8000 like his sisters. I know the brides family typically pays for the wedding (which my family is helping tons) the rest we are paying by ourselves. My family is paying about $9000. My FH and I are paying about $7000. As far as I know his family has offered to pay for the rehearsal. I know my FH isn't mad about not getting the money but he doesn't think it's very fair. Any advice on what to tell him?